Brake-shoe.



` PATBNTED NOV. 19, 1907.

No. S'L'MO.

F. R. SPEAR. BRAKE SHOE. APPLIOATION FILED JULYs, 1007.

PATENTBD NOV. l

F. R. SPEAR. BRAKE SHOE. APPLIUATION FILED JULYS, 1907 2 SHEETS-SHBET 2.

. UNITED FRANK R. SPEAK, OF CHLCAG, ILLlNOIS.

BRAKEssnoE.

Speccation of Letters Patent.

Patented Nov. 19, 1907.

Application filed July 3. 1907. Serial No. 381.974.

To all whom 'it 'may concern: Be it known that L FRANK R. SPEAR, a citizen of the United States, residing` at Chicago, in the county of Cook and State of illinois, have invented new and useful lmprovements in Brake-Shoes, of which the following is a specification.

The obj ect of this inventionis to strengthen and reinforce a brake shoe in a superior and inexpensive manner by embedding in the shoe, at or adjacent to its back, a strong but light iron. casting comprising a plurality of suitably connected rods or bars and made of cast malleable iron.

On October 2, 1906, Letters Patent No. 832,062 were granted to me for a brake shoe comprisinr a cast malleable iron plate securedto the body of the slice at or adjacent to its back and this has been found to be very satisfactory, but the casting hereinafter described is lighter and less expensive than the plate, it can be easily east in any desired form for any hind of slice, and it Vreinforces and strengthens the shoe in `an equally satisfactory manner.

The invention can be embodied in car shoes and locomotive driver shoes, solid, composite and composition, of all varieties, shapes and sizes.

1n the drawings l have shown the invention embodied in a variety of forms for several different kinds of shoes and referring thereto Figure 1 illustrates the invention in a simple form particularly adapted for a car shoe which is indicated in broken lines. Figs. 2 and 3 illustrate other forms of the invention for car shoes. Fig. 4 illustrates a form of the invention. particularly adapted for a locomotive blind driver shoe. Fig. 5 shous a forni for a flanged car shoe, the outline of the shoe being indicatedl in broken lines. Fig. 6 shows another form for a flanged car shoe. Fig. 7 shows another form vfor a locomotive blind driver shoe. Fig. 8 shows a form for a-flanged driver'shoe.

The reinforcement, in whatever form it may be embodied, consists of a frame made of cast malleable iron,+;.tliat is to sayit .is cast of high grade gray iron, in a mold .according to ordinary foundry practice, and

then subjected to an annealing process in a suitable oven.

It is well known that an ordinary gray` iron casting is brittle and has very littleten- Sile strength and hence a reinforcement for brake shoes consisting of an ordinary gray iron casting would not be serviceable. But the-annealing process toiighens the gray iron casting, increases its tensile strength, takes away its lirittleness and makes it somewhat elastic, so that it is admirably adapted for a reinforcing and strengthening means for brake shoes, 'lhe annealing process does not make the casting dnctilc so that it can be formed or shaped over a die like wrought iron or steel but gives to the casting a sui'licient amount of elasticity to produce, the best results iii making the shoe and in practical use thereof. The cast iron reinforcement still remains a castii'ig after the amicalingl process and will not injure a steel tire if it comes in contact therewith, the effect of the annealing process being only to change the casting from brittle to tough and from inelastic to somewhat elastic.

In Fig. 1 the reinforcement comprises two rods or bars 10 connected by a bridge 11 which forms the attaching lug of the shoe. The rods or bars and bridge are, of course,

. made integral in one casting as heretofore described and the body ofthe shoe, indicated by the broken lines 1.2 in Fig. 1 is cast on the reinforcing castingv in a familiar manner so lthat the rods or bars will be wholly or partially embedded in the slice at or adjacent to its back. i

In Fig. 2 the rods are also connected at their ends by cross pieces 13 and in Fig. 3 the cross pieces 14 are located between the bridge 11 and each end of the reinforcing casting.

In Fig. et the reinforcing casting comprises three rods or bars all connected at their ends by cross pieces 16 and two, 15 and 1.5', also connected between their ends by a bridge 17. The bars l5 and 15 may be coi'nieeted between their ends by cross pieces 18 as indicated in broken lines in Fig. 4. '.llie rod or bar 15 is provided with extensions 19, which may be located at the ends and at the middle tween their ends, as at A", so that the cast- Fig. 7 shows a form of reinforcing casting which may beused in a locomotive blind .driver shoe and. it comprises the side rods' or l.bars 21 connected at their ends by crosspieces 22, a hook 23 at one end ofthe casting, a cross'piece 24 connecting, the rods or bars 21 between their ends, and a rod or bar 25 extending om the hook end of the casting to the cross piece 24.

Fig. 8 illustrates a form of reinforcing casting made similar to the form shown in Fig. 7-

and provided with side lugs 26 to reinforce and strengthen the flange of a iianged locomotive shoe.

As my improved reinforcement is a casting it can be readily made in any desired shape and form and at low cost. The rods or bars have lbeveled sides and ends and the reinforcing casting is embedded Wholly or partly in the shoe body When the latter is cast and it not only reinforces and stren -thens the shoe but holds the parts thereo together case of fracture. As before mentioned the cast malleable iron reinforcing casting is particularly important because it will not injure the tire if it contacts therewith and for this reason the shoe can be Worn down much thinner than has been possible heretofore With reinforcements of other metal.

VVhatI claim and desire to secure by Letters Patent is:

1. A reinforcing and strengthening back for brake shoes consisting of a malleable iron fran-1e havin a plurality of rods or bars connected toget er and all made in one casting, sail rods or bars vhaving beveled sides and en s. a v

.2. A reinforcing and strengthening back for brake shoes consisting of a malleable iron frame having a plurality of rods or bars connected together at their ends, and a bridge connecting said rods or bars between their ends and adapted to form the attaching lug for the brake shoes and all made in one 4casting, said rods or bars having beveled sides and ends.

3. A reinforcing and strengthening back for brake shoes consisting of a malleable ,iron frame having a plurality of rods or bars connected together and oHset between their ends and all made in one casting. t

4. A reinforcing and strengthening back for brake shoes consisting of'a malleable iron frame havingla plurality of rods 'or bars con er and lugsl on one side of the 1 nected tovet frame and all made in one casting.

5. A reinforcing and strengthening back for brake shoes consisting of amalleable iron frame having a plurality of rods or bars offset between their ends and connected by a bridge adapted to form the attaching lug and by cross pieces on opposite sides of said bridge and havin on one side thereof projecting lugs and a l made in one casting.`

FRANK R. SPEAR.

Witnesses:

WM. 0. BELT, M. A. KIDDIE. 

